How the SQL UNION Operator Deals with NULL Values

So three NULLs were reduced to just one NULL. We can use the ALL keyword to include all duplicates, and that includes duplicate NULLs: Select null union all select null union all select null

Is Union Character Really Required for Union Type Injection?

1 union all select null,null,null,null,null,null,null,null,null,null#. According to my statistics it failed once with every 4 simple union based vulnerable urls." - according to our statistics safest character to use across every DBMS around (!) is NULL.

SQL-инъекции' union select null, null, null -- / Хабр

?id=1' union select null,null,table_name,null from information_schema.tables Это стало возможным благодаря добавлению таблицы information_schema в MySQL 5.0+ и по ее наличию также можно косвенно определить версию используемой БД.

Examining the database in SQL injection attacks. | Medium

sql injection "union select null" - CodeProject

Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. When you do a UNION query, both SELECT statements of the query must have the same number of columns.

Advanced SQL Injection: Union based | VK9 Security

Select column_name from information_schema.columns where table_schema=database() and table_name='tablenamehere'. SELECT is_srvrolemember(‘sysadmin’); — is your account a sysadmin? returns 1 for true, 0 for false, NULL for invalid role.

Статья - SQL-injection, начало - UNION BASED - Codeby.net

CREATE TABLE login ( id INT NOT NULL AUTO_INCREMENT, nickname VARCHAR(30) NOT NULL, login VARCHAR(40) NOT NULL, statement INT NOT NULL, PRIMARY KEY(id) ) Отправляем запрос 99999' union select 1,2,database(),4 -- - Вот и наша базка golden_key.

sql injection - How sqlmap works to get all database info - Information...

Type: UNION query Title: MySQL UNION query (NULL) - 11 columns Payload: cat=1 UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,CONCAT(0x7176627171 Since it’s doing a UNION query, you should be able to see the additionally selected data in the response.

SQL injection SOS !!! MySQL Решение и ответ на вопрос 401622

mysql - Confusing SQL error in SELECT NULL... - Stack Overflow